Create a public class called Simple that stores a single private String value.
Simple should implement a public function called setData that accepts a single String and changes the saved
value. (It should not return a value.)
Simple should also implement a public function called getData that returns the saved value.
You should also implement a public constructor allowing the value to be set when the class is created.
You should assert that String passed to the constructor and setValue is not null.
You're challenge is to write tests for this problem described above.
Stuck? You may find these lessons helpful: